stp study chhenai

STP Study M/s Hydrotech Paryavaran India

Pvt Ltd

CAA II UC Chennai Auto Ancillary Industrial Infrastructure

Up gradation CompanyAmbattur Industrial Estate Near HCL Unit - V

Chennai

STP (Gross Size 30 mt x70 mt)

View of STP from Top

Coarse Bar Screen (Constructed earlier but renovated by the firm )

Coarse Bar Screen Circular Tank Diameter 3 m depth 5 mt

Grit Chamber - constructed earlier

Grit Chamber I Diameter 4.5 mt depth 6.5 mt RCC const

Grit Chamber Ii Dia 5.0 mt depth 6.5 RCC Construction

Pumping Station Submersible Pump set 2 no ( 1 +1 standbye) each of 7.5 HP Collection tank dia 4.0 mt depth 6.5 mt RCC

Bye Pass structure Not in use @the Time of visit

STP Control Unit (Inside Brick Masonry Room)

CI Inlet Pipe( i/d 300 mm 2 no) to Equalization Tank

Collection Tank Cum Equalization Tank

Diameter 11 mt Depth RCC Const 3.8 mt

Excess effluent

again fed to tank

Inlet (One Inlet pipe no effluent)

Over flow Out Let at Equalization Tank

Electric Control of Two no Submersible Pumps at Equalization Tank

Stilling Chamber Rectangular- RCC

Fine Bar Screen Two numbers

Grit Chamber

FAB II (dia 7.3 mt )

Media in FAB II Out let of FAB II to Clarifier

MBBR Bio Reactor FAB I

Oil and Grease in F AB I MBBR Media in FAB I

Return sludge in FAB I

Return sludge Pump 2 HP

Return Sludge fed in to FAB I Pipe dia 63

mm

Air Compressor Unit( 3 no Compressors)

Air compressor distribution Header

Sludge and Grit Out lets to sludge bed

Grit out let from Grit Chamber

Sludge out at FAB I

RCC Clarifier (Dia 8.7 mt)

Clarifier Out fall to disinfection

Settled Effluent at the out let of clarifier

Disinfection unit

Steel structures ( like stair and Platform)

Sludge Bed

Sludge infilitrate collection sump

Sludge Distribution

Out Let Houdi and Out let into pond

Katcha Pond used to collect Treated effluent

Raw sewage and Treated Sewage

Lab at Site

Inspecting Team

Observations• Oil and grease has been observed in the FAB I so this needs to be removed at preliminary stage by

constructing oil and grease trap . This may constructed by department also• Return sludge is being fed in to FAB I . Normally in MBBR return sludge is not fed • STP was not running at Full capacity at the time of visit and no discharge meter was installed to check the

flow• Disinfection needs to be done regularly• Handling and Disposal of sludge agreement needs to be finalized with the operator • Plant was in good working condition .• Lab should have more testing equipment• Flow meter should be installed at STP• Following officers were present during visit• 1. Mr S Srinivasan Director and Mr N Palaniraja Chennai auto Ancillary Industrial Infrastructure Up

gradation Company • 2.Mr Rakesh Verma Sr Manger Projects M/s Hydro Tech Paryavaran India Pvt Ltd • 3Mr S Selvam Site Engineer M/s Hydro Tech Paryavaran India Pvt Ltd • Mr S Srinivasan is satisfied with the performance of the Plant executed by M/s Hydro Tech Paryavaran

India Pvt Ltd • Project was allotted on June 19 2006 vide CAAIIUC/STP and WTP /920 dt 19/6/2006 and completion time

was 15 months and it was completed June 17 2009 .The delay needs to be explained .and cost overruns if any needs to be checked .